> tcp_tw_recycle is incompatible with NAT on the server side

... because it will enforce the verification of TCP time stamps. Unless all 
clients behind a NAT (actually PAD/masquerading) device use identical 
timestamps 
(within a certain range), most of them will send invalid TCP timestamps so SYNs 
will get dropped.

This issue had also kept me busy for long hours and the basic insight is 
simple: 
Premature optimization is the root of all evil ;-), or, less philosophical, 
don't tune experimental parameters (the kernel docs are very clear about this!).

Nils
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